I said absolutely nothing about user experience. I said "wide open doesn't sell well" - it just hasn't on handhelds yet. I find the user experience on open systems - while sometimes maddening - better in a lot of instances albeit varied in some cases unnecessarily.
The UX on the WP7 is honestly looking to be quite good. That and a tie-in into the ever popular XBOX Live platform. That might sell a lot of units alone.